just posted this in another thread. I think the main fearures speak for themselves. The long ADC on native, clip gain, disk cache etc ... but one that isn't mentioned anywhere is the time it takes in 10 to swap between sessions.
Not sure how noticeable this is on average to small sessions but on some of my 'heavy duty DSP projects' is cuts times by 4 or 5.

Swapping between the same sessions that would take me 4 to 5 minutes on 9 (with DSP cache enabled) now only seems to take 30 seconds or so in 10. That alone saves hours by the end of the week.